sod job price

I am bidding on a sod job that is roughly 50x120ft which is 6,000 sq ft. The job will take 685 sq yds of sod. Sod cost me a 1.80 a sq yd with renting a bobcat and doing all the dirt work. Does $5,500.00 sound to cheap or to high, not sure what is the best way to estimate this because it is my first big sod job.